u=x^y x=f(t),y=g(t) 求du/dt

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u=x^yx=f(t),y=g(t)求du/dtu=x^yx=f(t),y=g(t)求du/dtu=x^yx=f(t),y=g(t)求du/dt打不出偏导符号用求导代替了du/dt=du/dx*dx/

u=x^y x=f(t),y=g(t) 求du/dt
u=x^y x=f(t),y=g(t) 求du/dt

u=x^y x=f(t),y=g(t) 求du/dt
打不出偏导符号用求导代替了
du/dt =du/dx*dx/dt+du/dy*dy/dt
=x^y*(y/x)*f'(t)+lnx*(x^y)*g'(t)